utils/ogl/src/lines.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        lines.h
   3 // Purpose:     wxLineShape
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     12/07/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _OGL_LINES_H_
  13 #define _OGL_LINES_H_
  14
  15 #ifdef __GNUG__
  16 #pragma interface "lines.h"
  17 #endif
  18
  19 class wxLabelShape;
  20 class wxPseudoMetaFile;
  21 class wxLineControlPoint;
  22 /*
  23  * Arcs with multiple arrowheads
  24  *
  25  */
  26
  27 // Types of arrowhead
  28 // (i) Built-in
  29 #define ARROW_HOLLOW_CIRCLE   1
  30 #define ARROW_FILLED_CIRCLE   2
  31 #define ARROW_ARROW           3
  32 #define ARROW_SINGLE_OBLIQUE  4
  33 #define ARROW_DOUBLE_OBLIQUE  5
  34 // (ii) Custom
  35 #define ARROW_METAFILE        20
  36
  37 // Position of arrow on line
  38 #define ARROW_POSITION_START  0
  39 #define ARROW_POSITION_END    1
  40 #define ARROW_POSITION_MIDDLE 2
  41
  42 // Line alignment flags
  43 // Vertical by default
  44 #define LINE_ALIGNMENT_HORIZ              1
  45 #define LINE_ALIGNMENT_VERT               0
  46 #define LINE_ALIGNMENT_TO_NEXT_HANDLE     2
  47 #define LINE_ALIGNMENT_NONE               0
  48
  49 class wxArrowHead: public wxObject
  50 {
  51  DECLARE_DYNAMIC_CLASS(wxArrowHead)
  52
  53  public:
  54   wxArrowHead(WXTYPE type = 0, int end = 0, double size = 0.0, double dist = 0.0, const wxString& name = "", wxPseudoMetaFile *mf = NULL,
  55             long arrowId = -1);
  56   ~wxArrowHead();
  57   wxArrowHead(wxArrowHead& toCopy);
  58
  59   inline WXTYPE _GetType() const { return m_arrowType; }
  60   inline int GetPosition() const { return m_arrowEnd; }
  61   inline void SetPosition(int pos) { m_arrowEnd = pos; }
  62   inline double GetXOffset() const { return m_xOffset; }
  63   inline double GetYOffset() const { return m_yOffset; }
  64   inline double GetSpacing() const { return m_spacing; }
  65   inline double GetSize() const { return m_arrowSize; }
  66   inline wxString GetName() const { return m_arrowName; }
  67   inline void SetXOffset(double x) { m_xOffset = x; }
  68   inline void SetYOffset(double y) { m_yOffset = y; }
  69   inline wxPseudoMetaFile *GetMetaFile() const { return m_metaFile; }
  70   inline long GetId() const { return m_id; }
  71   inline int GetArrowEnd() const { return m_arrowEnd; }
  72   inline double GetArrowSize() const { return m_arrowSize; }
  73   void SetSize(double size);
  74   inline void SetSpacing(double sp) { m_spacing = sp; }
  75
  76  protected:
  77   WXTYPE            m_arrowType;
  78   int               m_arrowEnd;         // Position on line
  79   double             m_xOffset;          // Distance from arc start or end, w.r.t. point on arrowhead
  80                                         // nearest start or end. If zero, use default spacing.
  81   double             m_yOffset;          // vertical offset (w.r.t. a horizontal line). Normally zero.
  82   double             m_spacing;          // Spacing from the last arrowhead
  83   double             m_arrowSize;        // Length of arrowhead
  84   wxString          m_arrowName;        // Name of arrow
  85   bool              m_saveToFile;       // TRUE if we want to save custom arrowheads to file.
  86   wxPseudoMetaFile* m_metaFile;         // Pseudo metafile if this is a custom arrowhead
  87   long              m_id;               // identifier
  88 };
  89
  90 // Line object
  91 class wxLineShape: public wxShape
  92 {
  93  DECLARE_DYNAMIC_CLASS(wxLineShape)
  94
  95  public:
  96   wxLineShape();
  97   ~wxLineShape();
  98
  99   // Called when a connected object has moved, to move the link to
 100   // correct position
 101   // moveControlPoints must be disabled when a control point is being
 102   // dragged.
 103   void OnMoveLink(wxDC& dc, bool moveControlPoints = TRUE);
 104   bool OnMovePre(wxDC& dc, double x, double y, double old_x, double old_y, bool display = TRUE);
 105   void OnDraw(wxDC& dc);
 106   void OnDrawContents(wxDC& dc);
 107   void OnDrawControlPoints(wxDC& dc);
 108   void OnEraseControlPoints(wxDC& dc);
 109   void OnErase(wxDC& dc);
 110   virtual inline void OnMoveControlPoint(int WXUNUSED(which), double WXUNUSED(x), double WXUNUSED(y)) {}
 111   void OnDrawOutline(wxDC& dc, double x, double y, double w, double h);
 112   void GetBoundingBoxMin(double *w, double *h);
 113   void FormatText(wxDC& dc, const wxString& s, int regionId = 0);
 114   virtual void SetEnds(double x1, double y1, double x2, double y2);
 115   virtual void GetEnds(double *x1, double *y1, double *x2, double *y2);
 116   inline virtual wxShape *GetFrom() { return m_from; }
 117   inline virtual wxShape *GetTo() { return m_to; }
 118   inline virtual int GetAttachmentFrom() { return m_attachmentFrom; }
 119   inline virtual int GetAttachmentTo() { return m_attachmentTo; }
 120
 121   virtual void SetFrom(wxShape *object);
 122   virtual void SetTo(wxShape *object);
 123   virtual void DrawArrows(wxDC& dc);
 124
 125   // Finds the x, y points at the two ends of the line.
 126   // This function can be used by e.g. line-routing routines to
 127   // get the actual points on the two node images where the lines will be drawn
 128   // to/from.
 129   void FindLineEndPoints(double *fromX, double *fromY, double *toX, double *toY);
 130
 131   // Format one region at this position
 132   void DrawRegion(wxDC& dc, wxShapeRegion *region, double x, double y);
 133
 134   // Erase one region at this position
 135   void EraseRegion(wxDC& dc, wxShapeRegion *region, double x, double y);
 136
 137   // Get the reference point for a label. Region x and y
 138   // are offsets from this.
 139   // position is 0 (middle), 1 (start), 2 (end)
 140   void GetLabelPosition(int position, double *x, double *y);
 141
 142   // Straighten verticals and horizontals
 143   virtual void Straighten(wxDC& dc);
 144
 145   // Not implemented
 146   inline void SetMaintainStraightLines(bool flag) { m_maintainStraightLines = flag; }
 147   inline bool GetMaintainStraightLines() const { return m_maintainStraightLines; }
 148
 149   // Make handle control points
 150   void MakeControlPoints();
 151   void ResetControlPoints();
 152
 153   // Make a given number of control points
 154   virtual void MakeLineControlPoints(int n);
 155   virtual wxNode *InsertLineControlPoint(wxDC* dc);
 156   virtual bool DeleteLineControlPoint();
 157   virtual void Initialise();
 158   inline wxList *GetLineControlPoints() { return m_lineControlPoints; }
 159
 160   // Override dragging behaviour - don't want to be able to drag lines!
 161   void OnDragLeft(bool draw, double x, double y, int keys=0, int attachment = 0);
 162   void OnBeginDragLeft(double x, double y, int keys=0, int attachment = 0);
 163   void OnEndDragLeft(double x, double y, int keys=0, int attachment = 0);
 164
 165   // Control points ('handles') redirect control to the actual shape, to make it easier
 166   // to override sizing behaviour.
 167   virtual void OnSizingDragLeft(wxControlPoint* pt, bool draw, double x, double y, int keys=0, int attachment = 0);
 168   virtual void OnSizingBeginDragLeft(wxControlPoint* pt, double x, double y, int keys=0, int attachment = 0);
 169   virtual void OnSizingEndDragLeft(wxControlPoint* pt, double x, double y, int keys=0, int attachment = 0);
 170
 171   // Override select, to create/delete temporary label-moving objects
 172   void Select(bool select = TRUE, wxDC* dc = NULL);
 173
 174   // Set to spline (TRUE) or line (FALSE)
 175   inline void SetSpline(bool spl) { m_isSpline = spl; }
 176   inline bool IsSpline() const { return m_isSpline; }
 177
 178   void Unlink();
 179   void SetAttachments(int from_attach, int to_attach);
 180   inline void SetAttachmentFrom(int attach) { m_attachmentFrom = attach; }
 181   inline void SetAttachmentTo(int attach) { m_attachmentTo = attach; }
 182
 183   bool HitTest(double x, double y, int *attachment, double *distance);
 184
 185 #ifdef PROLOGIO
 186   // Prolog database stuff
 187   virtual char *GetFunctor();
 188   virtual void WritePrologAttributes(wxExpr *clause);
 189   virtual void ReadPrologAttributes(wxExpr *clause);
 190 #endif
 191
 192   virtual void FindNth(wxShape *image, int *nth, int *no_arcs, bool incoming);
 193
 194   // Find which position we're talking about at this (x, y).
 195   // Returns ARROW_POSITION_START, ARROW_POSITION_MIDDLE, ARROW_POSITION_END
 196   int FindLinePosition(double x, double y);
 197
 198   // This is really to distinguish between lines and other images.
 199   // For lines, want to pass drag to canvas, since lines tend to prevent
 200   // dragging on a canvas (they get in the way.)
 201   virtual bool Draggable() const { return FALSE; }
 202
 203   // Does the copying for this object
 204   void Copy(wxShape& copy);
 205
 206   // Add an arrowhead.
 207   wxArrowHead *AddArrow(WXTYPE type, int end = ARROW_POSITION_END,
 208                 double arrowSize = 10.0, double xOffset = 0.0, const wxString& name = "",
 209                 wxPseudoMetaFile *mf = NULL, long arrowId = -1);
 210
 211   // Add an arrowhead in the position indicated by the reference
 212   // list of arrowheads, which contains all legal arrowheads for this
 213   // line, in the correct order.
 214   // E.g. reference list:      a b c d e
 215   //      Current line list:   a d
 216   // Add c, then line list is: a c d
 217   // If no legal arrowhead position, return FALSE.
 218   // Assume reference list is for one end only, since it potentially defines
 219   // the ordering for any one of the 3 positions. So we don't check
 220   // the reference list for arrowhead position.
 221   bool AddArrowOrdered(wxArrowHead *arrow, wxList& referenceList, int end);
 222
 223   // Delete arrowhead(s)
 224   void ClearArrowsAtPosition(int end = -1);
 225   bool ClearArrow(const wxString& name);
 226   wxArrowHead *FindArrowHead(int position, const wxString& name);
 227   wxArrowHead *FindArrowHead(long arrowId);
 228   bool DeleteArrowHead(int position, const wxString& name);
 229   bool DeleteArrowHead(long arrowId);
 230   void DrawArrow(wxDC& dc, wxArrowHead *arrow, double xOffset, bool proportionalOffset);
 231   inline void SetIgnoreOffsets(bool ignore) { m_ignoreArrowOffsets = ignore; }
 232   inline wxList& GetArrows() const { return (wxList&) m_arcArrows; }
 233
 234   // Find horizontal width for drawing a line with
 235   // arrows in minimum space. Assume arrows at
 236   // END only
 237   double FindMinimumWidth();
 238
 239   // Set alignment flags. ALIGNMENT NOT IMPLEMENTED.
 240   void SetAlignmentOrientation(bool isEnd, bool isHoriz);
 241   void SetAlignmentType(bool isEnd, int alignType);
 242   bool GetAlignmentOrientation(bool isEnd);
 243   int GetAlignmentType(bool isEnd);
 244
 245   // Find next control point in line after the start/end point
 246   // (depending on whether the node object is at start or end)
 247   wxRealPoint *GetNextControlPoint(wxShape *nodeObject);
 248   inline bool IsEnd(wxShape *nodeObject) const { return (m_to == nodeObject); }
 249
 250 private:
 251   bool              m_erasing;              // flag to say whether we're erasing or drawing
 252                                             // this line (really so metafiles can draw a
 253                                             // blank rectangle)
 254   bool              m_ignoreArrowOffsets;   // Don't always want to draw arrowhead offsets
 255                                             // because they may not work on tool palettes (for example)
 256   bool              m_isSpline;
 257   bool              m_maintainStraightLines;
 258
 259 protected:
 260   // Temporary list of line segment orientations
 261   // so we know what direction the line is supposed to be dog-legging
 262   // in. The values are integer: 0 for vertical, 1 for horizontal.
 263   wxList            m_lineOrientations;
 264
 265   // Temporary pointers for start, middle and end label editing objects
 266   // (active only when the line is selected)
 267   wxLabelShape*     m_labelObjects[3];
 268
 269   // These define the segmented line - not to be confused with temporary control
 270   // points which appear when object is selected (although in this case they'll
 271   // probably be the same)
 272   wxList*           m_lineControlPoints;
 273
 274   double             m_arrowSpacing; // Separation between adjacent arrows
 275
 276   wxShape*          m_to;
 277   wxShape*          m_from;
 278
 279 /*
 280   double             m_actualTextWidth;  // Space the text takes up
 281   double             m_actualTextHeight; // (depends on text content unlike nodes)
 282 */
 283   int               m_attachmentTo;   // Attachment point at one end
 284   int               m_attachmentFrom; // Attachment point at other end
 285
 286   // Alignment flags
 287   int               m_alignmentStart;
 288   int               m_alignmentEnd;
 289
 290   wxList            m_arcArrows;
 291
 292 };
 293
 294 #endif
 295     // _OGL_LINES_H_